-LRB- CNN -RRB- -- The bodies of four men kidnapped from a wedding in Ciudad Juarez , Mexico , have been found in the bed of a pickup truck in the city , municipal police said Tuesday .

The men , kidnapped Friday , included the groom , Rafael Morales ; his brother , Jaime Morales ; and their uncle , Guadalupe Morales , municipal police spokesman Jacinto Seguro said . The fourth person 's name has not been released .

All the bodies showed signs of torture , Seguro said .

The bodies were found Monday afternoon and were identified on Tuesday , he said .

`` It 's very sad , but , well ... that seems to be the situation , '' he added .

The FBI has information that Rafael Morales was a U.S. citizen from La Mesa , New Mexico , and others may be as well , said Special Agent Andrea Simmons of the El Paso , Texas , FBI office .

The FBI offered assistance this weekend to local and federal police in Mexico , Simmons said , but neither has requested anything so far .

The men were kidnapped after gunmen stormed into the church in the middle of the wedding ceremony on Friday , Chihuahua State Attorney General 's Office spokesman Carlos Gonzalez said Saturday . A fifth man was fatally shot in the incident , Gonzalez said .

`` It 's unclear if this was gang - or drug-related , '' he said .

Ciudad Juarez , Chihuahua , is the most violent city in Mexico , with more than 2,600 drug-related deaths in 2009 . At least 870 people have been killed in the city this year , according to local reports .

According to a report released in April by the Mexican government , Chihuahua is the Mexican state hardest hit by drug violence , with 6,757 people killed since the end of 2006 .

CNN 's Devon Sayers contributed to this report .

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Dead include the groom , who was a U.S. citizen , FBI says

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Four bodies showed signs of torture , police say

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A fifth man was fatally shot in the incident at Saturday wedding